Till sidans topp

Sidansvarig: Webbredaktion
Sidan uppdaterades: 2012-09-11 15:12

Tipsa en vän
Utskriftsversion

Insights on proximity eff… - Göteborgs universitet Till startsida
Webbkarta
Till innehåll Läs mer om hur kakor används på gu.se

Insights on proximity effect and multiphoton induced luminescence from gold nanospheres in far field optical microscopy

Artikel i vetenskaplig tidskrift
Författare Johan Borglin
Stina Guldbrand
Hanne Evenbratt
Vladimir Kirejev
Henrik Grönbeck
Marica B Ericson
Publicerad i Applied Physics Letters
Volym 107
Nummer/häfte 23
Sidor artikel nr 234101
ISSN 0003-6951
Publiceringsår 2015
Publicerad vid Institutionen för kemi och molekylärbiologi
Institutionen för fysik (GU)
Sidor artikel nr 234101
Språk en
Länkar dx.doi.org/10.1063/1.4936554
https://gup.ub.gu.se/file/183138
Ämnesord Gold, Nanoparticles, Plasmons, Luminescence, Cluster analysis
Ämneskategorier Optik

Sammanfattning

Goldnanoparticles can be visualized in far-field multiphoton laser-scanning microscopy (MPM) based on the phenomena of multiphoton induced luminescence (MIL). This is of interest for biomedical applications, e.g., for cancer diagnostics, as MPM allows for working in the near-infrared(NIR) optical window of tissue. It is well known that the aggregation of particles causes a redshift of the plasmon resonance, but its implications for MIL applying far-field MPM should be further exploited. Here, we explore MIL from 10 nm goldnanospheres that are chemically deposited on glass substrates in controlled coverage gradients using MPM operating in NIR range. The substrates enable studies of MIL as a function of inter-particle distance and clustering. It was shown that MIL was only detected from areas on the substrates where the particle spacing was less than one particle diameter, or where the particles have aggregated. The results are interpreted in the context that the underlying physical phenomenon of MIL is a sequential two-photon absorption process, where the first event is driven by the plasmon resonance. It is evident that goldnanospheres in this size range have to be closely spaced or clustered to exhibit detectable MIL using far-field MPM operating in the NIR region.

Sidansvarig: Webbredaktion|Sidan uppdaterades: 2012-09-11
Dela:

På Göteborgs universitet använder vi kakor (cookies) för att webbplatsen ska fungera på ett bra sätt för dig. Genom att surfa vidare godkänner du att vi använder kakor.  Vad är kakor?